This is an incredibly versatile jacket. I am ambivalent about the fact that all athletic wear from seemingly every company IS made out of plastic, but I can't deny the benefits that this material offers. It can be dyed any color in the rainbow and beyond, and it does keep you warm once you start wor...king out. It keeps heat in, and can be designed to "breathe," to an extent. The fit is beautiful. I got the large for extra room to move - I do like a roomier fit - and to layer. Wore it with the momentum tee on a 40F bikeride and was plenty comfortable. Layered a rain jacket on top and couldn't have asked for more. It's not often that I forget that I'm wearing clothes, but Athleta has really dialed in the "feel" of their garments. This is 100% an activewear jacket. Standing around in the cold gets chilly and the pockets aren't insulated. You do have to keep moving in order for this item to work for you. The medium would have been even more flattering. I can tell that the intended fit really skims over your body, and the arms wouldn't have been as tight as I'd feared. I do think I'll buy another one in medium just to have that look. I got compliments literally out of the gate: I walked out my front door and my boyfriend loved it. Got the plum, which is just a stunning color, and the mixed media styling levels it up. From a tall woman, THANK YOU for the long arms!